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ES 300 93 HARD SHAKE AT startup goes away after hard rev

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Old 01-15-09, 07:39 PM
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LS400rocksthewo
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Default ES 300 93 HARD SHAKE AT startup goes away after hard rev

ES 300 93

My car started to shake a bit at the beginning and after a rev it would go away i didnt think much of it
but now the shakes are harder and it seems i have to rev it harder

this only occurs in the morning when i first turn on the car

anyone know whats wrong
Old 01-15-09, 08:52 PM
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GEORGE_JET
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How long has it been since the last tune up? Does it happen more on colder mornings? If it has been a long time since the last tuneup, start there. If not, and it only occurs on cold mornings, check the cold start injector ( located on the intake plenum).
Old 01-16-09, 09:54 AM
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Walnut
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Is it misfiring? Otherwise check dogbone bushings and motor mounts.
Old 01-16-09, 10:45 AM
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Walnut
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If it's misfiring then maybe a sticking valve.
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